According to a Wednesday report by the Energy Information Administration, U.S. carbon dioxide emissions decreased through the first half of this year to their lowest level since 1991.
Factors affecting the 25-year low comes from the country’s continued shift away from coal to natural gas and the increase levels of wind and solar energy.
According to the EIA report, use of coal-burning electricity fell 18 percent from early 2015 to early 2016, and natural gas decreased by one percent. Renewables, such as wind, solar, and hydroelectric dams, increased by nine percent.
Despite decreases in emissions from the country’s power sector, greenhouse gas emissions from the transportation sector, such as from cars and trucks, increased by two percent from 2012 to 2014, which are the most recent years that data is available.